Great effort to find where the spokes were creaking!! I aplaud your efforts and concern for your wheels... I wish more people were that diligent.

I agree with Deb that you should be on a 36 spoke wheel, and Mavic or Velocity would be a good choice for rims. I built a wheel for a gentleman that is a bit heavier than you, he also has extremely strong legs, so he flexes the frame and the wheel with each pedal stroke. I built him a 36 spoke wheel with an Ultegra hub, Mavic rim and he has been riding that wheel for several weeks now. It may be a bit more expensive to go this way, but in the long run it will work well for you. Congradulations for losing weight while riding!